mirror of https://github.com/01-edu/public.git
47 lines
665 B
Markdown
47 lines
665 B
Markdown
## isprime
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### Instructions
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Write a function that returns `true` if the `int` passed as parameter is a prime number. Otherwise it returns `false`.
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The function must be optimized in order to avoid time-outs with the tester.
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(We consider that only positive numbers can be prime numbers)
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(We also consider that 1 is **not** a prime number)
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### Expected function
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```go
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func IsPrime(nb int) bool {
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}
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```
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### Usage
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Here is a possible program to test your function :
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```go
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package main
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import (
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"fmt"
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"piscine"
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)
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func main() {
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fmt.Println(piscine.IsPrime(5))
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fmt.Println(piscine.IsPrime(4))
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}
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```
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And its output :
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```console
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$ go run .
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true
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false
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$
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```
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